Push-button shifter assembly with button state determination logic

A method of determining a button state of a push-button shifter assembly in a system, the method comprising:

• receiving binary electronic state selection signals from the push-button shifter assembly via a controller;
• and
• determining the button state of each of a plurality of push-buttons of the push-button shifter assembly in response to the received binary electronic state selection signals, including:
• determining, in response to receiving the electronic state selection signal, if all of the at least three redundant switches are closed;
• if all of the at least three redundant switches are not closed, determining whether fewer than all of the at least three redundant switches have closed and opened within a calibrated time interval of each other;
• and
• executing a control action with respect to the system based on the determined button state.

A vehicle comprising:

• an internal combustion engine having an output shaft;
• an input clutch;
• a transmission having an input shaft that is connected to the output shaft via the input clutch;
• actuator assembly operable to achieve a selected operating range of the transmission in response to an electronic range selection signal, wherein the selected operating range is one of a park (P), reverse (R), neutral (N), drive (D), and low-gear (L) operating range;
• a push-button shifter assembly having a plurality of dome-type push-buttons in which a cap covers the three redundant switches, wherein the dome-type push-buttons include each of a P, R, N, D, and L push-button corresponding to a respective one of the P, R, N, D, and L operating ranges, wherein each of the plurality of push-buttons includes three redundant switches connected in electrical parallel with each other, with a binary open/closed state of each of the three redundant switches defining the electronic range selection signal;
• and
• a controller in by-wire communication with the actuator assembly and the push-button shifter assembly, wherein the controller is programmed to receive the electronic range selection signal, and to determine a button state of each the push-buttons covered by the cap by determining, in response to receiving the electronic range selection signal, if the three redundant switches have all closed, and, if all three redundant switches have not closed, whether two of the three redundant switches have closed and opened within a calibrated time interval of each other.